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Sourdough Starter & First Loaf

From mixing flour and water on Day 1 to pulling a crackly loaf from the oven, this checklist walks you through every feeding, fold, and baking step — so nothing gets skipped and your first loaf actually rises. For more background and examples, see the guidance below; for built-in tools and options, use the quick tools guide.

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Choose the right flour for your starter

Unbleached all-purpose flour works reliably for most beginners. Whole wheat and rye flours contain more wild yeast and bacteria on the bran, so many bakers add 10–20% rye or whole wheat to accelerate the first few days of activity. Avoid bleached flour — the bleaching chemicals can inhibit microbial growth. Once your starter is mature and active, you can switch to any flour you prefer for ongoing maintenance.

Select a clear, wide-mouth jar (at least 1 quart / 1 liter)

Glass is ideal because you can watch bubbles forming inside the culture. Before you begin, wash the jar thoroughly with hot water and dish soap — avoid antibacterial soap, which can kill the microbes you are trying to cultivate. A wide mouth makes stirring and cleaning much easier than a narrow-neck jar. Have a rubber band or strip of masking tape ready to mark the level after each feeding.

Mix Day 1: combine 50g whole wheat flour with 50g unchlorinated water

Tap water often contains chlorine or chloramine that can slow or stall fermentation. If your tap water smells of chlorine, let it sit uncovered in a glass for 30 minutes, or use filtered water. Weigh everything on a kitchen scale — measuring by volume is too imprecise for sourdough. Stir vigorously for 1–2 minutes to incorporate air, which supports early aerobic yeast activity. The mixture should look like a thick, smooth batter with no dry flour remaining.

Cover loosely and place in a consistently warm spot (75–80°F / 24–27°C)

Wild yeast and lactic acid bacteria perform best between 75–80°F. Below 70°F fermentation slows dramatically; above 85°F the culture can become overly acidic or produce too much alcohol. Good spots to try: on top of your refrigerator (often warmed by the compressor motor), inside a cold oven with only the oven light on, or near (not directly on top of) a heating vent. An inexpensive probe thermometer helps you find the correct microclimate in your specific kitchen.

Label the jar with today's date, feeding time, and ambient temperature

Tracking the exact time of each feeding becomes important once you are watching rise-and-fall cycles. A strip of painter's tape on the jar works well. Recording the room temperature alongside the time will help you understand why the starter behaves differently from day to day — a cooler night or warmer afternoon directly affects how quickly it peaks and falls.

Discard all but 20–25g of starter before each feeding

Discarding serves two purposes: it removes accumulated acid that would eventually inhibit your yeast colony, and it keeps the volume manageable — without discarding, you would need kilograms of flour each day. The discarded portion is not rubbish. It can be stored in a separate jar in the refrigerator and used in pancakes, crackers, pizza dough, waffles, or flatbreads. Most discard recipes require no peak timing, just active or cold starter.

Feed with 50g unbleached all-purpose flour and 50g room-temperature water

Keep feeding weights consistent until your starter is reliably active. This 1:1:1 ratio (equal parts starter, flour, water by weight) works well at 75–80°F. In hot weather above 80°F, a 1:5:5 ratio (1 part starter to 5 parts flour to 5 parts water) slows fermentation and reduces over-acidification. Always weigh flour and water separately rather than measuring by volume.

Stir vigorously until completely uniform with no dry flour remaining

Air incorporation during stirring supports early yeast activity. A chopstick or butter knife works well in a narrow jar. Scrape down the sides after stirring — bits of dried starter stuck to the jar walls can develop unwanted mold, which can visually alarm you even when the starter itself is healthy. The finished mixture should look smooth, like thick pancake batter.

Mark the post-feed level and log time, temperature, peak height, and smell

This daily log becomes your troubleshooting reference. Note the peak height (how far above the tape mark the starter rises), the time it took to reach that peak, the smell at feeding time versus at peak, and the bubble pattern. By Day 4–5 most starters show some activity; by Day 7–10 most are reliably doubling. If yours is not progressing, the log will help you pinpoint whether the cause is temperature, flour type, or water quality.

Switch to twice-daily feedings once the starter consistently doubles within 8 hours

Once your starter reliably doubles within 4–8 hours of a feeding, a single daily feed may not be enough — the yeast will exhaust its food supply and collapse before the next feed. Twice-daily feedings spaced roughly 12 hours apart (morning and evening) keep the culture in a healthy active cycle. This switch typically happens between Day 5 and Day 8, depending on your kitchen temperature and flour.

#10

Perform the float test: drop a small spoonful into a glass of water

A ripe starter floats because it is filled with carbon dioxide bubbles. A starter that sinks immediately is not yet ready and needs more time or another feed. The float test is a useful indicator but not definitive on its own — some high-hydration starters float even when underripe. Use it alongside the rise pattern and smell as a combined readiness picture rather than as the sole test.

#11

Confirm the starter reliably doubles (or more) within 4–8 hours of a feeding

This is the most reliable readiness indicator. Mark the post-feed level and check every 30–60 minutes. A healthy starter will dome upward, reach its peak, then begin to fall and show a slight concave surface. Use the starter at or just before peak — when it is tallest and most domed. Using it too early (before it has doubled) gives under-leavened bread with a dense crumb; using it after collapse gives overly sour, flat bread.

#12

Smell the starter: tangy, yeasty, or mildly fruity is good; sharp acetone is not

A healthy mature starter smells pleasantly sour — like yogurt, beer, or sometimes a hint of ripe fruit. A very sharp, chemical smell resembling nail-polish remover or acetone means the starter is over-fermented and hungry; feed it immediately and wait at least one full feed cycle before baking. A persistently cheesy, putrid, or rotten smell may indicate unwanted bacteria contamination; if this continues after two to three normal feedings, discard all but 5g and restart with fresh flour and water.

#13

Confirm a domed top and bubbles visible throughout the jar sides

A flat or concave top means the starter has already passed its peak and is deflating. Bubbles throughout the body of the culture — not just on the surface — indicate strong, even fermentation. If you only see bubbles on top but the interior looks dense, stir more vigorously after each feeding and check whether the jar location is warm enough.

#14

Weigh all ingredients before mixing: 450g bread flour, 325g water, 100g ripe starter, 9g salt

Sourdough operates on baker's percentages where every ingredient is measured relative to total flour weight. This beginner formula is 72% hydration, 22% starter, 2% salt — a forgiving starting point. Pre-weighing everything prevents scrambling mid-mix and lets you adjust hydration if your specific flour brand absorbs water differently. A kitchen scale accurate to 1 gram is essential; digital scales under $20 work fine.

#15

Autolyse: mix flour with 300g of the water until no dry flour remains; rest 30–60 minutes

Autolyse is a rest period that allows the flour to fully hydrate before gluten development begins. This makes the final dough more extensible and easier to handle. Hold back the remaining 25g of water to dissolve the salt in later — this technique, called bassinage, prevents the salt from directly contacting and tightening the gluten before you are ready. Cover the bowl with a damp towel or plastic wrap during the rest to prevent a dry skin from forming.

#16

Add the ripe starter to the autolysed dough and mix thoroughly using pinch-and-fold

The starter should be at or very close to its peak for maximum leavening strength. Use the pinch-and-fold method: pinch through the dough with your fingers to break up the starter, then fold the dough repeatedly over itself. It takes 3–5 minutes of active hand mixing for the starter to fully incorporate. The dough will feel sticky and shaggy at first — this is normal and not a sign that anything has gone wrong.

#17

Dissolve salt in the reserved 25g of water and fold into the dough

Salt tightens the gluten network and controls fermentation speed by mildly inhibiting bacteria. Adding it after autolyse (rather than at the start) allows full flour hydration without interference. Sprinkle the salt-water mixture over the dough and use the same pinch-and-fold technique for 2–3 minutes. The dough will feel slightly firmer and more resistant immediately after the salt is incorporated.

#18

Mark the starting dough level with tape on the side of the bowl

Bulk fermentation is complete when the dough has increased by 50–75% in volume and displays a jiggly, aerated texture. Without the tape mark, accurately judging a 50–75% rise from memory is very difficult, especially for first-time bakers. A straight-sided, clear container (like a large Cambro or deli container) makes rise percentages far easier to judge than a wide, sloped mixing bowl.

#19

Perform 4 sets of stretch-and-folds, one set every 30 minutes during the first 2 hours

Stretch-and-fold builds gluten structure without full kneading. Wet your hand, grab one side of the dough, stretch it upward as far as it will extend without tearing, and fold it over to the opposite side. Rotate the bowl 90 degrees and repeat — four folds complete one set. Each set takes about 30 seconds. After all four sets the dough will be noticeably smoother, more elastic, and will hold its shape rather than spreading flat when you lift it.

#20

Monitor room temperature and adjust your expected bulk time accordingly

Bulk fermentation typically takes 4–6 hours at 75–78°F. Expect 6–8 hours at 70°F and as little as 3–4 hours at 80°F. Under-fermented dough tears when shaped and produces a dense, gummy crumb with no open structure. Over-fermented dough becomes slack and sticky, spreads flat instead of holding its shape, and is very difficult to score cleanly — this is the most common beginner mistake and it cannot be fixed once it happens.

#21

Confirm bulk is complete: 50–75% rise, jiggly wobble, domed surface, visible bubbles at the edges

The jiggle test is one of the most reliable end-of-bulk indicators: gently shake the container. Properly fermented dough wobbles like set gelatin, not like pancake batter or liquid. The surface should show a slight dome and visible gas bubbles near the edges. Running a wet finger along the edge of the dough should reveal an airy, web-like texture. If the dough is very sticky and flowing sideways rather than holding its shape, it has likely over-fermented.

#22

Pre-shape into a loose round on a lightly floured surface and bench rest 20–30 minutes

Dust your work surface lightly with rice flour — it does not absorb into the dough the way all-purpose flour does, which means less unwanted flour incorporation and a cleaner shape. Use a bench scraper to fold the dough under itself into a rough ball without degassing it completely. The bench rest allows the gluten to relax after the tension of handling, making it much easier to achieve a tight final shape. Cover with a clean kitchen towel during the rest.

#23

Final shape: build surface tension by dragging the dough toward you across the counter

Surface tension is what keeps the loaf tall during baking rather than spreading into a flat disc. For a boule (round), cup both hands around the dough and drag it toward you across a lightly floured surface — friction creates tension on the top skin. For a batard (oval), roll the dough toward you while pressing gently. You should feel resistance as the skin tightens; the top surface should look smooth and taut with no tears.

#24

Transfer seam-side up into a well-floured banneton and refrigerate overnight

Dust the banneton generously with rice flour, or a 50/50 blend of rice flour and all-purpose flour — rice flour prevents sticking far more effectively than all-purpose alone. Place the shaped dough seam-side up so that when you flip it out for baking, the smooth side faces up. Cover the banneton with a shower cap or seal it inside a large plastic bag to prevent drying. Refrigerate for 8–16 hours. Cold proofing slows fermentation, develops more complex sour flavor, firms the dough for easier scoring, and gives you flexibility on baking time.

#25

Preheat the Dutch oven inside the oven at 500°F (260°C) for at least 45 minutes

The Dutch oven traps steam released from the cold dough during the first phase of baking — this steam is essential for oven spring, the dramatic final rise that happens in the first 10–15 minutes. Without trapped steam the crust sets too quickly and prevents the loaf from fully expanding. A combo cooker (cast iron skillet plus matching lid) is an excellent alternative. Do not skip the full 45-minute preheat — an insufficiently hot vessel will not generate the steam needed.

#26

Score the cold dough with a razor blade (lame) at a 30–45° angle in one swift motion

Scoring controls where the loaf opens during baking. A single curved score along the top, angled at 30–45 degrees rather than straight down, creates the classic raised ear that most bakers aim for. Use a dedicated bread lame or single-edge razor blade — a regular kitchen knife drags and deflates the dough instead of cutting cleanly. Work quickly once the dough is out of the fridge; it warms up fast, which makes scoring progressively harder.

#27

Bake covered at 500°F (260°C) for 20 minutes, then remove the lid and bake at 450°F (232°C) for 20–25 minutes

The covered phase creates the steam environment needed for maximum oven spring and a thin, extensible crust. The uncovered phase develops the dark, crackly exterior and drives out remaining moisture. Check the loaf at 15 minutes into the uncovered phase — every oven runs differently, and a slightly thinner loaf or a very dark Dutch oven can overbrown the bottom quickly. If the crust is darkening faster than the interior is cooking, tent loosely with foil for the final minutes.

#28

Check internal temperature: 205–210°F (96–99°C) confirms the crumb is fully set

A loaf that looks perfectly browned on the outside can still have an undercooked, gummy center. Insert a probe thermometer through the bottom of the loaf rather than the top to get an accurate read without disturbing the crust. If you do not have a thermometer, tap the bottom of the loaf firmly — a hollow sound indicates doneness. Err toward the darker end of browning on your first bake; the flavor is richer and the interior will be fully cooked.

#29

Cool completely on a wire rack for at least 1–2 hours before slicing

This is the hardest step to follow and also one of the most consequential. Cutting sourdough while hot compresses the crumb, releases steam that was still finishing the internal bake, and leaves the interior gummy even in a perfectly executed loaf. The crumb continues to set structurally as the loaf cools. When you do cut, use a serrated bread knife in long, light sawing strokes — pressing down crushes the ear and compresses the open crumb you worked to develop.

#30

The Realistic Timeline: Day 1 to First Loaf

Day 1–2

Mix starter. Little to no visible activity. This is completely normal.

Day 3–5

Bubbles begin. Possibly strong smell. Yeast colony is establishing.

Day 6–10

Starter doubles reliably within 8 hours of feeding. Ready to bake.

Day 11–14

First loaf in the oven. Mix-to-table takes about 30 additional hours.

Most first-time bakers underestimate this. A robust starter takes 7–14 days, not 2–3. Baking with a young, immature starter is the single most common reason a first loaf fails to rise — no amount of correct technique compensates for a starter that cannot yet leaven bread. The waiting is the work.

🔍 Reading Your Crumb: What the Interior Tells You

✅ Open, irregular holes

Strong fermentation, well-developed gluten, and correct hydration for your flour. The crumb should feel moist and slightly chewy. This is the target.

⚠️ Dense, tight crumb

Most often signals under-fermentation or a starter that was not yet at peak when added. The loaf may also have torn at the score line rather than opening into an ear.

⚠️ Gummy or wet crumb

Caused by cutting too soon in most cases. If the internal temperature was correct and you still waited two hours, reduce hydration by 10–15g on the next bake.

Large tunnel near the bottom

A hallmark of over-proofing. Gas expanded so aggressively during baking that a large void formed near the base while the top crumb looks almost normal. Shorten the cold proof by 2–3 hours next time, or reduce the starter percentage by 10g.

Flat loaf, no ear

Three separate issues can each produce this result: insufficient surface tension during shaping, over-proofed dough that has lost its structure, or a score that went straight down at 90 degrees instead of at an angle. They also compound each other — a slightly over-proofed loaf with a vertical score and loose shaping will spread dramatically.

📖 The Impatient Baker's Frisbee

A home baker documented her first sourdough attempt on Day 4 of her starter — far too early. She mixed the dough correctly, performed every stretch-and-fold on schedule, shaped with care, and baked in a well-preheated Dutch oven. The result was a pale, barely-risen disc with a raw center. Her technique was sound; her starter was not. At four days old it had not yet established a yeast colony strong enough to leaven 450g of flour. Two weeks later, same recipe, same hands, mature starter: textbook open crumb, glossy crust, proper ear. She had bought a banneton, a lame, and specialty bread flour for that first bake. The only variable that changed the outcome was time.

Keeping Your Starter Alive Between Bakes

Baking weekly

Keep 30–50g of starter in the refrigerator. Feed it once a week — discard down, add fresh flour and water, let it sit at room temperature for 2–4 hours, then return it to the fridge. The day before you plan to bake, remove it and give it 1–2 room-temperature feeds to wake up the yeast colony before using it at peak.

Baking infrequently (months between bakes)

Dry your starter for long-term storage: spread a thin layer on parchment paper and let it dry completely at room temperature for 24–48 hours. Break the dried sheet into flakes and store in a sealed jar away from light. Dried starter keeps for years. To revive, mix a small amount of flakes with equal parts flour and water and feed daily for 3–5 days until active again.

💡 The Discard Has a Second Life

The portion removed before each feeding carries enough wild yeast and lactic acid bacteria to add flavor and a subtle lift to quick-cook recipes that do not depend on a full rise. Sourdough discard pancakes — made by substituting 200g of discard for 100g flour and 100g liquid in any standard pancake recipe — are ready in minutes and taste noticeably better than their conventional counterparts. It also works well folded into pizza dough at about 20% of total flour weight, or into waffles, flour tortillas, crumpets, and banana bread. Unlike active starter used for bread, discard used in these applications does not need to be at peak — cold, recently fed, mildly acidic discard is actually ideal, since the acidity is what contributes most of the flavor.

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Sourdough Starter & First Loaf

Checklist Items

Setting Up Your Starter

Daily Feeding Routine (Days 2–7+)

Testing Starter Readiness

Mixing & Autolyse

Bulk Fermentation

Shaping & Cold Proofing

Baking Day